Update changelog.md with any changes since the last update, and
with revisions from the draft blog post.

Download updated translation strings from Transifex and commit them.

Use build-release-tarball to generate a release tarball.

Test the new tarball extensively, both new install and upgrade from last
release, on both Trusty and Xenial.

Repeat until release is ready.

When near finished: move the blog post draft to Ghost. (For a draft
in Dropbox Paper, use “··· > Download > Markdown” to get a pretty
good markup conversion.) Proofread the post, especially for
formatting.